Update README, CONTRIBUTING, DEVELOPER to the new standard #7783

Job	Run time
Typecheck and Lint Core	2m 45s
Test Core	4m 8s
Build Core and publish docker image	6m 6s
Build gateways (playout-gateway)	1m 13s
Check for multiple library versions	1m 15s
Build gateways (mos-gateway)	1m 23s
Lint Package (blueprints-integration)	1m 2s
Lint Package (server-core-integration)	57s
Publish Docs	2m 24s
Lint Package (playout-gateway)	1m 7s
Lint Package (mos-gateway)	1m 5s
Test Package (blueprints-integration, 14.x)	1m 7s
Lint Package (corelib)	1m 4s
Test Package (blueprints-integration, 16.x)	1m 0s
Lint Package (shared-lib)	54s
Test Package (server-core-integration, 14.x)	1m 15s
Lint Package (job-worker)	1m 31s
Test Package (server-core-integration, 16.x)	1m 12s
Test Package (shared-lib, 14.x)	1m 4s
Test Package (shared-lib, 16.x)	58s
Test Package (14.x, corelib, true)	1m 16s
Test Package (14.x, job-worker, true)	2m 13s
Release Lib	0s
	36m 59s

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